/*
 * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "SystemTime.h"

#include "NotImplemented.h"
#include <windows.h>
#include <float.h>

namespace WebCore {

double currentTime()
{
	FILETIME ft;
	GetSystemTimeAsFileTime(&ft);

	// As per Windows documentation for FILETIME, copy the resulting FILETIME structure to a
	// ULARGE_INTEGER structure using memcpy (using memcpy instead of direct assignment can
	// prevent alignment faults on 64-bit Windows).

	ULARGE_INTEGER t;
	memcpy(&t, &ft, sizeof(t));

	// Windows file times are in 100s of nanoseconds.
	// To convert to seconds, we have to divide by 10,000,000, which is more quickly
	// done by multiplying by 0.0000001.

	// Between January 1, 1601 and January 1, 1970, there were 369 complete years,
	// of which 89 were leap years (1700, 1800, and 1900 were not leap years).
	// That is a total of 134774 days, which is 11644473600 seconds.

	return t.QuadPart * 0.0000001 - 11644473600.0;
}

float userIdleTime()
{
#ifdef _WIN32_WCE
    // Needed for back/forward cache.
    notImplemented();
    return FLT_MAX;
#else
    LASTINPUTINFO lastInputInfo = {0};
    lastInputInfo.cbSize = sizeof(LASTINPUTINFO);
    if (::GetLastInputInfo(&lastInputInfo))
        return (GetTickCount() - lastInputInfo.dwTime) * 0.001; // ::GetTickCount returns ms of uptime valid for up to 49.7 days.
    return FLT_MAX; // return an arbitrarily high userIdleTime so that releasing pages from the page cache isn't postponed. 
#endif
}

}
